batgrbproduct Analysis for Trigger=157870

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Wed Jan  9 14:13:36 EST 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger157870/GCN5_download_cron
======================================================================

  Trigger: 00157870      Segment: 000

  BAT Trigger Time: 149857896   [s; MET]
      Trigger Stop: 149857960   [s; MET]
               UTC: 2005-10-01T11:11:36.241320    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 350.972781554212   Dec: -31.5278427417636  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.29
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.29

  Flight Position:   [ source = BAT ]
    RA: 350.972781554212   Dec: -31.5278427417636  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 350.981908925252   Dec: -31.5189954110892  [deg; J2000]  
        { 23h 23m 55.7s , -31d 31' 08.4" }
         +/- 2.39000936715285 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.37732982991009 [arcmin] (formal 1-sigma fit error)
    SNR: 8.76087569739097
    RA  =  23h 23m 55.7s  (350.981909 deg.)
    Dec = -31d 31'  8" (-31.518995 deg.)
 
  Angular difference between Flight and Ground position is 0.706906 arcmin
 
  Partial Coding Fraction: 0.7421875    [ including projection effects ]

  Duration
     T90: 189.071999996901 +/- 22.9591763707417
        Measured from: -11.7319999933243
                   to: 177.340000003576     [s; relative to TRIGTIME]
     T50: 61.9760000109673 +/- 39.0443344547218
        Measured from: 90.4519999921322
                   to: 152.428000003099     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 130.419999986887     
                   to: 131.419999986887     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -25.5679999887943     
                   to: 196.719999998808     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.361215   1.257552   0.683410   0.027238
           0.075850   0.077354   0.067866   0.060406 [error]
 Peak      0.020489   0.022241   0.016146   0.002955
           0.004544   0.004724   0.004151   0.003542 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
=== Fluence/Peak Flux Summary ===
 
              Model    Band1    Band2    Band3    Band4    Band5    Total      
                       15-25    25-50   50-100  100-350   15-150   15-350   keV
Fluence   Power-law 4.33e-07 5.55e-07 5.19e-07 8.56e-07 1.79e-06 2.36e-06   erg/cm2
              Error 4.80e-08 3.98e-08 6.64e-08 2.22e-07 1.49e-07 2.88e-07   erg/cm2
Peak flux Power-law 1.90e-01 1.76e-01 1.13e-01 1.11e-01 5.25e-01 5.90e-01   ph/cm2/s
              Error 6.49e-02 3.89e-02 3.37e-02 6.61e-02 1.14e-01 1.30e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.19e-07 5.72e-07 5.16e-07 5.23e-07 1.75e-06 2.00e-06   erg/cm2
              Error 5.48e-08 5.11e-08 7.05e-08 4.13e-07 1.72e-07 4.66e-07   erg/cm2
Peak flux Cutoff-PL 1.67e-01 1.93e-01 1.20e-01 4.66e-02 5.11e-01 5.26e-01   ph/cm2/s
              Error 7.89e-02 5.12e-02 3.95e-02 8.29e-02 1.18e-01 1.51e-01   ph/cm2/s
 
Fluence        Band 4.16e-07 5.70e-07 5.15e-07 5.23e-07 1.74e-06 2.07e-06   erg/cm2
              Error 5.44e-08 5.09e-08 7.04e-08 4.13e-07 1.72e-07 4.56e-07   erg/cm2
Peak flux      Band 1.67e-01 1.93e-01 1.20e-01 4.68e-02 5.11e-01 5.26e-01   ph/cm2/s
              Error 7.88e-02 5.13e-02 3.95e-02 8.23e-02 1.18e-01 1.04e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.096    0.148    -      -           8.69e-04 7.89e-05   43.374 57
CPL   1.811    0.427      28.9 4999.4      1.25e-03 8.46e-04   42.555  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.642    0.379    -      -           4.03e-03 9.44e-04   59.266 57
CPL   0.781    1.774      68.2 5000.0      1.14e-02 9.38e-02   58.426 56
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err   : 90% error of the photon index
Epeak      : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm       : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedom
 
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
 
T90 in the 50-300 keV band: 186.432000 sec.
T50 in the 50-300 keV band: 131.776000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  222.288  -25.568  196.720
T90   189.072  -11.732  177.340
T50    61.976   90.452  152.428
Peak    1.000  130.420  131.420

Image

Pre-slew 15-350 keV image (Event data; bkg subtracted)

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  350.9819 -31.5190 0.0221   29.3   13.3       1.0205     8.8  TRIG_00157870       
------------------------------------------
 
Foreground time interval of the image:
-25.568  70.801 (delta_t =  96.369 [sec])
Background time interval of the image:
-299.000 -99.120 (delta_t = 199.880 [sec])
-98.000 -41.749 (delta_t =  56.251 [sec])
-41.000 -25.568 (delta_t =  15.432 [sec])

Lightcurves

Notes:

1 s binning

From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval

64 ms binning

Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec

16 ms binning

From T100_start-5 s to T100_start+5 s

8 ms binning

From T100_start-3 s to T100_start+3 s

2 ms binning

From T100_start-1 s to T100_start+1 s

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Spectra

Notes:

Time averaged spectrum fit using the pre-slew DRM

Power-law model
Time interval is from  -25.568 sec. to  196.720 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.09566     ( -0.145312   0.150562 )
Norm@50keV  : 8.691431E-04    ( -7.962924E-05   7.816241E-05) )
------------------------------------------------------------
 Chi-Squared =      43.37440     using    59 PHA bins.
 Reduced chi-squared =     0.7609544     for     57 degrees of freedom
 Null hypothesis probability = 0.908
 
Photon flux (15-150 keV)    in 222.3 sec: 0.136446 ( -0.010044  0.010063 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.79457e-06 ( -1.47927e-07  1.49461e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -25.568 sec. to  196.720 sec.
Photon index: 1.81117     ( -0.602787   0.252166 )
Epeak [keV] : 28.8930      ( -27.7670 9971.11 )
Norm@50keV  : 1.252091E-03    ( -2.663729E-04   1.426296E-03) )
------------------------------------------------------------
 Chi-Squared =      42.55479     using    59 PHA bins.
 but latest trial   2.06056     gives Chi-Squared =  0.984451
 but latest trial   1.12604     gives Chi-Squared =   3.03547
 but latest trial  9.481476E-04 gives Chi-Squared =   3.58297
 Reduced chi-squared =     0.7599069     for     56 degrees of freedom
 Null hypothesis probability = 0.907
 
Photon flux (15-150 keV)    in 222.3 sec: 0.134387 ( -0.010756  0.005303 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.74656e-06 ( -1.71042e-07  1.72451e-07 ) ergs/cm2
 
Band function
Time interval is from  -25.568 sec. to  196.720 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.80741   ( -8.19259   0.550043 )
beta        : -9.36726    ( -0.632737   7.39314 )
Epeak [keV] : 29.1873      ( -29.0873 9970.81 )
Norm@50keV   : 1.256511E-03    ( -3.875328E-04   1.421697E-03) )
------------------------------------------------------------
 Chi-Squared =      42.55508     using    59 PHA bins.
 Reduced chi-squared =     0.7737287     for     55 degrees of freedom
 Null hypothesis probability = 0.890
 
Photon flux (15-150 keV)    in 222.3 sec: 0.134382 ( -0.010751  0.010729 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.74365e-06 ( -1.7066e-07  1.7327e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from  130.420 sec. to  131.420 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.64173     ( -0.368251   0.390375 )
Norm@50keV  : 4.031337E-03    ( -9.579994E-04   9.308783E-04) )
------------------------------------------------------------
 Chi-Squared =      59.26562     using    59 PHA bins.
 Reduced chi-squared =      1.039748     for     57 degrees of freedom
 Null hypothesis probability = 0.393
 
Photon flux (15-150 keV)    in 1.000 sec: 0.524961 ( -0.11431  0.11445 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.75034e-08 ( -9.2484e-09  9.5103e-09 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  130.420 sec. to  131.420 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.780927     ( -2.36710   1.18059 )
Epeak [keV] : 68.2053      ( -68.1953 9931.79 )
Norm@50keV  : 1.139032E-02    ( -1.139032E-02   0.176227 )
------------------------------------------------------------
 Chi-Squared =      58.42587     using    59 PHA bins.
 Reduced chi-squared =      1.043319     for     56 degrees of freedom
 Null hypothesis probability = 0.386
 
Photon flux (15-150 keV)    in 1.000 sec: 0.511027 ( -0.118908  0.117282 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.56022e-08 ( -9.7241e-09  1.01453e-08 ) ergs/cm2
 
Band function
Time interval is from  130.420 sec. to  131.420 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.785599   ( -9.21440   1.46692 )
beta        : -9.36389    ( -0.636114   11.2128 )
Epeak [keV] : 68.3150      ( -26.5412 9931.68 )
Norm@50keV   : 1.132599E-02    ( -1.132599E-02   0.177004 )
------------------------------------------------------------
 Chi-Squared =      58.42595     using    59 PHA bins.
 Reduced chi-squared =      1.062290     for     55 degrees of freedom
 Null hypothesis probability = 0.351
 
Photon flux (15-150 keV)    in 1.000 sec: 0.511152 ( -0.119035  0.117613 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.55834e-08 ( -9.7226e-09  1.01412e-08 ) ergs/cm2
 
Plot creation:
Wed Jan  9 14:28:15 EST 2008